I forget the details but I think if you don't have iDrive you don't get the combox. No combox means you do need the y cable for listening to your iPod, even in 2011.75 cars and beyond. Sorry, but I get stuck on iDrive equipped cars as that is what I have!
2011 Space Grey E90 M3, DCT, Comp. Pkg.
1997 Z3 2.8, Artic Silver, Tanin Red interior, MT
1974 2002tii, Inka, MT